In-ear headphone



FIG. 1 is a perspective view of an in-ear headphone, in accordance with the present invention.

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is an opposing side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines showing the environment in the Figures are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an in-ear headphone, as shown and described. 